Add many platforms arbitrarily

Related to #214; added additional architectures which may or may not work. I'd rather someone find out it doesn't work then for them to be blocked from even trying.

.github/workflows/docker-image.yaml

@@ -73,6 +73,7 @@ jobs:
       - name: Build and push Docker image
         uses: docker/build-push-action@v5
         with:
+          platforms: linux/amd64,linux/386,linux/arm64,linux/arm/v7,linux/arm/v6,linux/ppc64le,linux/s390x
           context: .
           push: true
           tags: ${{ steps.meta.outputs.tags }}